Splitter Parameter

Electrical requirement

Range

Values

Frequency range

POTS splitter band

DC to 17.3 KHz

Nominal voice band

0.3KHz to 3.4KHz

Pulse metering tone

12 or 16 KHz ± 1%

ADSL band

25KHz to 2,208KHz

Ringing frequency

22Hz to 50Hz

Impedance

Line impedance ZL

200Hz to 4KHz

600Ω

CO impedance ZTc

200Hz to 4KHz

600Ω

RT impedance Ztr

200Hz to 4KHz

600Ω

ADSL modem impedance

25KHz to 2.208MHz

100Ω

Capacitance at loop open

20nF <= C <= 115nF

Operation voltage voice band

Nominal signal

21mVpp to 5.4Vpp

Pulse metering tone

10 Vp-p to 30.2 Vp-p

Ringing signal

100Vrms

DC voltage

100V

Maximum AC voltage

100Vrms with -100VDC offset

Maximum differential

250V

Current voice band

DC loop current

<100mA

Transient current

<400mA

DC resistance

Short resistance

The sum of A-wire and B-wire resistance from the line port to the exchange port; term = 0 Ω

<= 25 Ω

Isolation resistance, branch to earth

100VDC; term = ∞ Ω

>20 MΩ

Isolation resistance, branch to branch

100VDC; term = ∞ Ω

>5 MΩ

Return loss

( PSTN interface)

300Hz < f < 500Hz

> 14 + 18.05 log (f/300) dB

500Hz <f <2000Hz

> 18 dB

2000Hz < f < 3400Hz

> 18 17.35 log (f/2000) dB

Return loss

( POTS  interface)

300Hz < f < 500Hz

> 14 + 18.05 log (f/300) dB

500Hz <f <2000Hz

> 18 dB

2000Hz < f < 3400Hz

> 18 17.35 log (f/2000) dB

Insertion loss

F = 1KHz

< 0.3 dB

Insertion loss distortion

200Hz <f < 4KHz (relative to 1KHz)

< ±0.3 dB

Group delay

200 <f < 600Hz

< 250 μS

600 <f < 3.2KHz

< 150 μS

3.2K <f < 4KHz

< 250 μS

Unbalance about earth (between

PSTN and LINE interface)

15Hz <f < 1000Hz

> 58 dB

1000Hz<f<3400Hz

>60.1-f/480 dB

3.4KHZ<f<30KHz

>40dB

30KHz<f<2.2MHz

>50dB

2.2MHz<f<5MHz

>30dB

Longitudinal balance

(between DSL and LINE interface)

15Hz <f < 1000Hz

> 58 dB

1000Hz<f<3400Hz

>60.1-f/480 dB

3.4KHZ<f<30kHz

>40dB

30KHz<f<2.2MHz

>50dB

2.2MHz<f<5MHz

>30dB

Nonlinear distortion

Second-order modulation

> 57 dB (compare signal of -10dBm)

Third-order modulation

> 60 dB (compare signal of -10dBm)

Frequencies and levels for pulse

metering tone

12 or 16 KHz ± 1%

< 3 dB

Maximum level

< 5Vrms in 200 Ω

Stop band attenuation (600 Ω)

Loading ADSL signal path (100 Ω)

30KHz to 4.4MHz

>65 dB

25KHz to 4.4MHz

<0.3 dB